1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu-common.h" 27 28 #include "net/net.h" 29 #include "clients.h" 30 #include "hub.h" 31 #include "hw/qdev-properties.h" 32 #include "net/slirp.h" 33 #include "net/eth.h" 34 #include "util.h" 35 36 #include "monitor/monitor.h" 37 #include "qemu/help_option.h" 38 #include "qapi/qapi-commands-net.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/cutils.h" 44 #include "qemu/config-file.h" 45 #include "qemu/ctype.h" 46 #include "qemu/id.h" 47 #include "qemu/iov.h" 48 #include "qemu/qemu-print.h" 49 #include "qemu/main-loop.h" 50 #include "qemu/option.h" 51 #include "qapi/error.h" 52 #include "qapi/opts-visitor.h" 53 #include "sysemu/sysemu.h" 54 #include "sysemu/runstate.h" 55 #include "sysemu/sysemu.h" 56 #include "net/filter.h" 57 #include "qapi/string-output-visitor.h" 58 59 /* Net bridge is currently not supported for W32. */ 60 #if !defined(_WIN32) 61 # define CONFIG_NET_BRIDGE 62 #endif 63 64 static VMChangeStateEntry *net_change_state_entry; 65 static QTAILQ_HEAD(, NetClientState) net_clients; 66 67 /***********************************************************/ 68 /* network device redirectors */ 69 70 int parse_host_port(struct sockaddr_in *saddr, const char *str, 71 Error **errp) 72 { 73 gchar **substrings; 74 struct hostent *he; 75 const char *addr, *p, *r; 76 int port, ret = 0; 77 78 substrings = g_strsplit(str, ":", 2); 79 if (!substrings || !substrings[0] || !substrings[1]) { 80 error_setg(errp, "host address '%s' doesn't contain ':' " 81 "separating host from port", str); 82 ret = -1; 83 goto out; 84 } 85 86 addr = substrings[0]; 87 p = substrings[1]; 88 89 saddr->sin_family = AF_INET; 90 if (addr[0] == '\0') { 91 saddr->sin_addr.s_addr = 0; 92 } else { 93 if (qemu_isdigit(addr[0])) { 94 if (!inet_aton(addr, &saddr->sin_addr)) { 95 error_setg(errp, "host address '%s' is not a valid " 96 "IPv4 address", addr); 97 ret = -1; 98 goto out; 99 } 100 } else { 101 he = gethostbyname(addr); 102 if (he == NULL) { 103 error_setg(errp, "can't resolve host address '%s'", addr); 104 ret = -1; 105 goto out; 106 } 107 saddr->sin_addr = *(struct in_addr *)he->h_addr; 108 } 109 } 110 port = strtol(p, (char **)&r, 0); 111 if (r == p) { 112 error_setg(errp, "port number '%s' is invalid", p); 113 ret = -1; 114 goto out; 115 } 116 saddr->sin_port = htons(port); 117 118 out: 119 g_strfreev(substrings); 120 return ret; 121 } 122 123 char *qemu_mac_strdup_printf(const uint8_t *macaddr) 124 { 125 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", 126 macaddr[0], macaddr[1], macaddr[2], 127 macaddr[3], macaddr[4], macaddr[5]); 128 } 129 130 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) 131 { 132 snprintf(nc->info_str, sizeof(nc->info_str), 133 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", 134 nc->model, 135 macaddr[0], macaddr[1], macaddr[2], 136 macaddr[3], macaddr[4], macaddr[5]); 137 } 138 139 static int mac_table[256] = {0}; 140 141 static void qemu_macaddr_set_used(MACAddr *macaddr) 142 { 143 int index; 144 145 for (index = 0x56; index < 0xFF; index++) { 146 if (macaddr->a[5] == index) { 147 mac_table[index]++; 148 } 149 } 150 } 151 152 static void qemu_macaddr_set_free(MACAddr *macaddr) 153 { 154 int index; 155 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 156 157 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 158 return; 159 } 160 for (index = 0x56; index < 0xFF; index++) { 161 if (macaddr->a[5] == index) { 162 mac_table[index]--; 163 } 164 } 165 } 166 167 static int qemu_macaddr_get_free(void) 168 { 169 int index; 170 171 for (index = 0x56; index < 0xFF; index++) { 172 if (mac_table[index] == 0) { 173 return index; 174 } 175 } 176 177 return -1; 178 } 179 180 void qemu_macaddr_default_if_unset(MACAddr *macaddr) 181 { 182 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; 183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; 184 185 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { 186 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { 187 return; 188 } else { 189 qemu_macaddr_set_used(macaddr); 190 return; 191 } 192 } 193 194 macaddr->a[0] = 0x52; 195 macaddr->a[1] = 0x54; 196 macaddr->a[2] = 0x00; 197 macaddr->a[3] = 0x12; 198 macaddr->a[4] = 0x34; 199 macaddr->a[5] = qemu_macaddr_get_free(); 200 qemu_macaddr_set_used(macaddr); 201 } 202 203 /** 204 * Generate a name for net client 205 * 206 * Only net clients created with the legacy -net option and NICs need this. 207 */ 208 static char *assign_name(NetClientState *nc1, const char *model) 209 { 210 NetClientState *nc; 211 int id = 0; 212 213 QTAILQ_FOREACH(nc, &net_clients, next) { 214 if (nc == nc1) { 215 continue; 216 } 217 if (strcmp(nc->model, model) == 0) { 218 id++; 219 } 220 } 221 222 return g_strdup_printf("%s.%d", model, id); 223 } 224 225 static void qemu_net_client_destructor(NetClientState *nc) 226 { 227 g_free(nc); 228 } 229 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 230 unsigned flags, 231 const struct iovec *iov, 232 int iovcnt, 233 void *opaque); 234 235 static void qemu_net_client_setup(NetClientState *nc, 236 NetClientInfo *info, 237 NetClientState *peer, 238 const char *model, 239 const char *name, 240 NetClientDestructor *destructor) 241 { 242 nc->info = info; 243 nc->model = g_strdup(model); 244 if (name) { 245 nc->name = g_strdup(name); 246 } else { 247 nc->name = assign_name(nc, model); 248 } 249 250 if (peer) { 251 assert(!peer->peer); 252 nc->peer = peer; 253 peer->peer = nc; 254 } 255 QTAILQ_INSERT_TAIL(&net_clients, nc, next); 256 257 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); 258 nc->destructor = destructor; 259 QTAILQ_INIT(&nc->filters); 260 } 261 262 NetClientState *qemu_new_net_client(NetClientInfo *info, 263 NetClientState *peer, 264 const char *model, 265 const char *name) 266 { 267 NetClientState *nc; 268 269 assert(info->size >= sizeof(NetClientState)); 270 271 nc = g_malloc0(info->size); 272 qemu_net_client_setup(nc, info, peer, model, name, 273 qemu_net_client_destructor); 274 275 return nc; 276 } 277 278 NICState *qemu_new_nic(NetClientInfo *info, 279 NICConf *conf, 280 const char *model, 281 const char *name, 282 void *opaque) 283 { 284 NetClientState **peers = conf->peers.ncs; 285 NICState *nic; 286 int i, queues = MAX(1, conf->peers.queues); 287 288 assert(info->type == NET_CLIENT_DRIVER_NIC); 289 assert(info->size >= sizeof(NICState)); 290 291 nic = g_malloc0(info->size + sizeof(NetClientState) * queues); 292 nic->ncs = (void *)nic + info->size; 293 nic->conf = conf; 294 nic->opaque = opaque; 295 296 for (i = 0; i < queues; i++) { 297 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, 298 NULL); 299 nic->ncs[i].queue_index = i; 300 } 301 302 return nic; 303 } 304 305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) 306 { 307 return nic->ncs + queue_index; 308 } 309 310 NetClientState *qemu_get_queue(NICState *nic) 311 { 312 return qemu_get_subqueue(nic, 0); 313 } 314 315 NICState *qemu_get_nic(NetClientState *nc) 316 { 317 NetClientState *nc0 = nc - nc->queue_index; 318 319 return (NICState *)((void *)nc0 - nc->info->size); 320 } 321 322 void *qemu_get_nic_opaque(NetClientState *nc) 323 { 324 NICState *nic = qemu_get_nic(nc); 325 326 return nic->opaque; 327 } 328 329 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) 330 { 331 assert(nc != NULL); 332 NetClientState *ncs = nc + queue_index; 333 return ncs->peer; 334 } 335 336 static void qemu_cleanup_net_client(NetClientState *nc) 337 { 338 QTAILQ_REMOVE(&net_clients, nc, next); 339 340 if (nc->info->cleanup) { 341 nc->info->cleanup(nc); 342 } 343 } 344 345 static void qemu_free_net_client(NetClientState *nc) 346 { 347 if (nc->incoming_queue) { 348 qemu_del_net_queue(nc->incoming_queue); 349 } 350 if (nc->peer) { 351 nc->peer->peer = NULL; 352 } 353 g_free(nc->name); 354 g_free(nc->model); 355 qapi_free_NetdevInfo(nc->stored_config); 356 if (nc->destructor) { 357 nc->destructor(nc); 358 } 359 } 360 361 void qemu_del_net_client(NetClientState *nc) 362 { 363 NetClientState *ncs[MAX_QUEUE_NUM]; 364 int queues, i; 365 NetFilterState *nf, *next; 366 367 assert(nc->info->type != NET_CLIENT_DRIVER_NIC); 368 369 /* If the NetClientState belongs to a multiqueue backend, we will change all 370 * other NetClientStates also. 371 */ 372 queues = qemu_find_net_clients_except(nc->name, ncs, 373 NET_CLIENT_DRIVER_NIC, 374 MAX_QUEUE_NUM); 375 assert(queues != 0); 376 377 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { 378 object_unparent(OBJECT(nf)); 379 } 380 381 /* If there is a peer NIC, delete and cleanup client, but do not free. */ 382 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 383 NICState *nic = qemu_get_nic(nc->peer); 384 if (nic->peer_deleted) { 385 return; 386 } 387 nic->peer_deleted = true; 388 389 for (i = 0; i < queues; i++) { 390 ncs[i]->peer->link_down = true; 391 } 392 393 if (nc->peer->info->link_status_changed) { 394 nc->peer->info->link_status_changed(nc->peer); 395 } 396 397 for (i = 0; i < queues; i++) { 398 qemu_cleanup_net_client(ncs[i]); 399 } 400 401 return; 402 } 403 404 for (i = 0; i < queues; i++) { 405 qemu_cleanup_net_client(ncs[i]); 406 qemu_free_net_client(ncs[i]); 407 } 408 } 409 410 void qemu_del_nic(NICState *nic) 411 { 412 int i, queues = MAX(nic->conf->peers.queues, 1); 413 414 qemu_macaddr_set_free(&nic->conf->macaddr); 415 416 for (i = 0; i < queues; i++) { 417 NetClientState *nc = qemu_get_subqueue(nic, i); 418 /* If this is a peer NIC and peer has already been deleted, free it now. */ 419 if (nic->peer_deleted) { 420 qemu_free_net_client(nc->peer); 421 } else if (nc->peer) { 422 /* if there are RX packets pending, complete them */ 423 qemu_purge_queued_packets(nc->peer); 424 } 425 } 426 427 for (i = queues - 1; i >= 0; i--) { 428 NetClientState *nc = qemu_get_subqueue(nic, i); 429 430 qemu_cleanup_net_client(nc); 431 qemu_free_net_client(nc); 432 } 433 434 g_free(nic); 435 } 436 437 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) 438 { 439 NetClientState *nc; 440 441 QTAILQ_FOREACH(nc, &net_clients, next) { 442 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 443 if (nc->queue_index == 0) { 444 func(qemu_get_nic(nc), opaque); 445 } 446 } 447 } 448 } 449 450 bool qemu_has_ufo(NetClientState *nc) 451 { 452 if (!nc || !nc->info->has_ufo) { 453 return false; 454 } 455 456 return nc->info->has_ufo(nc); 457 } 458 459 bool qemu_has_vnet_hdr(NetClientState *nc) 460 { 461 if (!nc || !nc->info->has_vnet_hdr) { 462 return false; 463 } 464 465 return nc->info->has_vnet_hdr(nc); 466 } 467 468 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) 469 { 470 if (!nc || !nc->info->has_vnet_hdr_len) { 471 return false; 472 } 473 474 return nc->info->has_vnet_hdr_len(nc, len); 475 } 476 477 void qemu_using_vnet_hdr(NetClientState *nc, bool enable) 478 { 479 if (!nc || !nc->info->using_vnet_hdr) { 480 return; 481 } 482 483 nc->info->using_vnet_hdr(nc, enable); 484 } 485 486 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, 487 int ecn, int ufo) 488 { 489 if (!nc || !nc->info->set_offload) { 490 return; 491 } 492 493 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo); 494 } 495 496 void qemu_set_vnet_hdr_len(NetClientState *nc, int len) 497 { 498 if (!nc || !nc->info->set_vnet_hdr_len) { 499 return; 500 } 501 502 nc->vnet_hdr_len = len; 503 nc->info->set_vnet_hdr_len(nc, len); 504 } 505 506 int qemu_set_vnet_le(NetClientState *nc, bool is_le) 507 { 508 #ifdef HOST_WORDS_BIGENDIAN 509 if (!nc || !nc->info->set_vnet_le) { 510 return -ENOSYS; 511 } 512 513 return nc->info->set_vnet_le(nc, is_le); 514 #else 515 return 0; 516 #endif 517 } 518 519 int qemu_set_vnet_be(NetClientState *nc, bool is_be) 520 { 521 #ifdef HOST_WORDS_BIGENDIAN 522 return 0; 523 #else 524 if (!nc || !nc->info->set_vnet_be) { 525 return -ENOSYS; 526 } 527 528 return nc->info->set_vnet_be(nc, is_be); 529 #endif 530 } 531 532 int qemu_can_receive_packet(NetClientState *nc) 533 { 534 if (nc->receive_disabled) { 535 return 0; 536 } else if (nc->info->can_receive && 537 !nc->info->can_receive(nc)) { 538 return 0; 539 } 540 return 1; 541 } 542 543 int qemu_can_send_packet(NetClientState *sender) 544 { 545 int vm_running = runstate_is_running(); 546 547 if (!vm_running) { 548 return 0; 549 } 550 551 if (!sender->peer) { 552 return 1; 553 } 554 555 return qemu_can_receive_packet(sender->peer); 556 } 557 558 static ssize_t filter_receive_iov(NetClientState *nc, 559 NetFilterDirection direction, 560 NetClientState *sender, 561 unsigned flags, 562 const struct iovec *iov, 563 int iovcnt, 564 NetPacketSent *sent_cb) 565 { 566 ssize_t ret = 0; 567 NetFilterState *nf = NULL; 568 569 if (direction == NET_FILTER_DIRECTION_TX) { 570 QTAILQ_FOREACH(nf, &nc->filters, next) { 571 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 572 iovcnt, sent_cb); 573 if (ret) { 574 return ret; 575 } 576 } 577 } else { 578 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { 579 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, 580 iovcnt, sent_cb); 581 if (ret) { 582 return ret; 583 } 584 } 585 } 586 587 return ret; 588 } 589 590 static ssize_t filter_receive(NetClientState *nc, 591 NetFilterDirection direction, 592 NetClientState *sender, 593 unsigned flags, 594 const uint8_t *data, 595 size_t size, 596 NetPacketSent *sent_cb) 597 { 598 struct iovec iov = { 599 .iov_base = (void *)data, 600 .iov_len = size 601 }; 602 603 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); 604 } 605 606 void qemu_purge_queued_packets(NetClientState *nc) 607 { 608 if (!nc->peer) { 609 return; 610 } 611 612 qemu_net_queue_purge(nc->peer->incoming_queue, nc); 613 } 614 615 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) 616 { 617 nc->receive_disabled = 0; 618 619 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { 620 if (net_hub_flush(nc->peer)) { 621 qemu_notify_event(); 622 } 623 } 624 if (qemu_net_queue_flush(nc->incoming_queue)) { 625 /* We emptied the queue successfully, signal to the IO thread to repoll 626 * the file descriptor (for tap, for example). 627 */ 628 qemu_notify_event(); 629 } else if (purge) { 630 /* Unable to empty the queue, purge remaining packets */ 631 qemu_net_queue_purge(nc->incoming_queue, nc->peer); 632 } 633 } 634 635 void qemu_flush_queued_packets(NetClientState *nc) 636 { 637 qemu_flush_or_purge_queued_packets(nc, false); 638 } 639 640 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, 641 unsigned flags, 642 const uint8_t *buf, int size, 643 NetPacketSent *sent_cb) 644 { 645 NetQueue *queue; 646 int ret; 647 648 #ifdef DEBUG_NET 649 printf("qemu_send_packet_async:\n"); 650 qemu_hexdump(stdout, "net", buf, size); 651 #endif 652 653 if (sender->link_down || !sender->peer) { 654 return size; 655 } 656 657 /* Let filters handle the packet first */ 658 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, 659 sender, flags, buf, size, sent_cb); 660 if (ret) { 661 return ret; 662 } 663 664 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, 665 sender, flags, buf, size, sent_cb); 666 if (ret) { 667 return ret; 668 } 669 670 queue = sender->peer->incoming_queue; 671 672 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); 673 } 674 675 ssize_t qemu_send_packet_async(NetClientState *sender, 676 const uint8_t *buf, int size, 677 NetPacketSent *sent_cb) 678 { 679 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, 680 buf, size, sent_cb); 681 } 682 683 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) 684 { 685 return qemu_send_packet_async(nc, buf, size, NULL); 686 } 687 688 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) 689 { 690 if (!qemu_can_receive_packet(nc)) { 691 return 0; 692 } 693 694 return qemu_net_queue_receive(nc->incoming_queue, buf, size); 695 } 696 697 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov, 698 int iovcnt) 699 { 700 if (!qemu_can_receive_packet(nc)) { 701 return 0; 702 } 703 704 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt); 705 } 706 707 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) 708 { 709 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, 710 buf, size, NULL); 711 } 712 713 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, 714 int iovcnt, unsigned flags) 715 { 716 uint8_t *buf = NULL; 717 uint8_t *buffer; 718 size_t offset; 719 ssize_t ret; 720 721 if (iovcnt == 1) { 722 buffer = iov[0].iov_base; 723 offset = iov[0].iov_len; 724 } else { 725 offset = iov_size(iov, iovcnt); 726 if (offset > NET_BUFSIZE) { 727 return -1; 728 } 729 buf = g_malloc(offset); 730 buffer = buf; 731 offset = iov_to_buf(iov, iovcnt, 0, buf, offset); 732 } 733 734 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { 735 ret = nc->info->receive_raw(nc, buffer, offset); 736 } else { 737 ret = nc->info->receive(nc, buffer, offset); 738 } 739 740 g_free(buf); 741 return ret; 742 } 743 744 static ssize_t qemu_deliver_packet_iov(NetClientState *sender, 745 unsigned flags, 746 const struct iovec *iov, 747 int iovcnt, 748 void *opaque) 749 { 750 NetClientState *nc = opaque; 751 int ret; 752 753 754 if (nc->link_down) { 755 return iov_size(iov, iovcnt); 756 } 757 758 if (nc->receive_disabled) { 759 return 0; 760 } 761 762 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) { 763 ret = nc->info->receive_iov(nc, iov, iovcnt); 764 } else { 765 ret = nc_sendv_compat(nc, iov, iovcnt, flags); 766 } 767 768 if (ret == 0) { 769 nc->receive_disabled = 1; 770 } 771 772 return ret; 773 } 774 775 ssize_t qemu_sendv_packet_async(NetClientState *sender, 776 const struct iovec *iov, int iovcnt, 777 NetPacketSent *sent_cb) 778 { 779 NetQueue *queue; 780 size_t size = iov_size(iov, iovcnt); 781 int ret; 782 783 if (size > NET_BUFSIZE) { 784 return size; 785 } 786 787 if (sender->link_down || !sender->peer) { 788 return size; 789 } 790 791 /* Let filters handle the packet first */ 792 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, 793 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 794 if (ret) { 795 return ret; 796 } 797 798 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, 799 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); 800 if (ret) { 801 return ret; 802 } 803 804 queue = sender->peer->incoming_queue; 805 806 return qemu_net_queue_send_iov(queue, sender, 807 QEMU_NET_PACKET_FLAG_NONE, 808 iov, iovcnt, sent_cb); 809 } 810 811 ssize_t 812 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) 813 { 814 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); 815 } 816 817 NetClientState *qemu_find_netdev(const char *id) 818 { 819 NetClientState *nc; 820 821 QTAILQ_FOREACH(nc, &net_clients, next) { 822 if (nc->info->type == NET_CLIENT_DRIVER_NIC) 823 continue; 824 if (!strcmp(nc->name, id)) { 825 return nc; 826 } 827 } 828 829 return NULL; 830 } 831 832 int qemu_find_net_clients_except(const char *id, NetClientState **ncs, 833 NetClientDriver type, int max) 834 { 835 NetClientState *nc; 836 int ret = 0; 837 838 QTAILQ_FOREACH(nc, &net_clients, next) { 839 if (nc->info->type == type) { 840 continue; 841 } 842 if (!id || !strcmp(nc->name, id)) { 843 if (ret < max) { 844 ncs[ret] = nc; 845 } 846 ret++; 847 } 848 } 849 850 return ret; 851 } 852 853 static int nic_get_free_idx(void) 854 { 855 int index; 856 857 for (index = 0; index < MAX_NICS; index++) 858 if (!nd_table[index].used) 859 return index; 860 return -1; 861 } 862 863 int qemu_show_nic_models(const char *arg, const char *const *models) 864 { 865 int i; 866 867 if (!arg || !is_help_option(arg)) { 868 return 0; 869 } 870 871 printf("Supported NIC models:\n"); 872 for (i = 0 ; models[i]; i++) { 873 printf("%s\n", models[i]); 874 } 875 return 1; 876 } 877 878 void qemu_check_nic_model(NICInfo *nd, const char *model) 879 { 880 const char *models[2]; 881 882 models[0] = model; 883 models[1] = NULL; 884 885 if (qemu_show_nic_models(nd->model, models)) 886 exit(0); 887 if (qemu_find_nic_model(nd, models, model) < 0) 888 exit(1); 889 } 890 891 int qemu_find_nic_model(NICInfo *nd, const char * const *models, 892 const char *default_model) 893 { 894 int i; 895 896 if (!nd->model) 897 nd->model = g_strdup(default_model); 898 899 for (i = 0 ; models[i]; i++) { 900 if (strcmp(nd->model, models[i]) == 0) 901 return i; 902 } 903 904 error_report("Unsupported NIC model: %s", nd->model); 905 return -1; 906 } 907 908 static int net_init_nic(const Netdev *netdev, const char *name, 909 NetClientState *peer, Error **errp) 910 { 911 int idx; 912 NICInfo *nd; 913 const NetLegacyNicOptions *nic; 914 915 assert(netdev->type == NET_CLIENT_DRIVER_NIC); 916 nic = &netdev->u.nic; 917 918 idx = nic_get_free_idx(); 919 if (idx == -1 || nb_nics >= MAX_NICS) { 920 error_setg(errp, "too many NICs"); 921 return -1; 922 } 923 924 nd = &nd_table[idx]; 925 926 memset(nd, 0, sizeof(*nd)); 927 928 if (nic->has_netdev) { 929 nd->netdev = qemu_find_netdev(nic->netdev); 930 if (!nd->netdev) { 931 error_setg(errp, "netdev '%s' not found", nic->netdev); 932 return -1; 933 } 934 } else { 935 assert(peer); 936 nd->netdev = peer; 937 } 938 nd->name = g_strdup(name); 939 if (nic->has_model) { 940 nd->model = g_strdup(nic->model); 941 } 942 if (nic->has_addr) { 943 nd->devaddr = g_strdup(nic->addr); 944 } 945 946 if (nic->has_macaddr && 947 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { 948 error_setg(errp, "invalid syntax for ethernet address"); 949 return -1; 950 } 951 if (nic->has_macaddr && 952 is_multicast_ether_addr(nd->macaddr.a)) { 953 error_setg(errp, 954 "NIC cannot have multicast MAC address (odd 1st byte)"); 955 return -1; 956 } 957 qemu_macaddr_default_if_unset(&nd->macaddr); 958 959 if (nic->has_vectors) { 960 if (nic->vectors > 0x7ffffff) { 961 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); 962 return -1; 963 } 964 nd->nvectors = nic->vectors; 965 } else { 966 nd->nvectors = DEV_NVECTORS_UNSPECIFIED; 967 } 968 969 nd->used = 1; 970 nb_nics++; 971 972 return idx; 973 } 974 975 976 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( 977 const Netdev *netdev, 978 const char *name, 979 NetClientState *peer, Error **errp) = { 980 [NET_CLIENT_DRIVER_NIC] = net_init_nic, 981 #ifdef CONFIG_SLIRP 982 [NET_CLIENT_DRIVER_USER] = net_init_slirp, 983 #endif 984 [NET_CLIENT_DRIVER_TAP] = net_init_tap, 985 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, 986 #ifdef CONFIG_VDE 987 [NET_CLIENT_DRIVER_VDE] = net_init_vde, 988 #endif 989 #ifdef CONFIG_NETMAP 990 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, 991 #endif 992 #ifdef CONFIG_NET_BRIDGE 993 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, 994 #endif 995 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, 996 #ifdef CONFIG_VHOST_NET_USER 997 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, 998 #endif 999 #ifdef CONFIG_VHOST_NET_VDPA 1000 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, 1001 #endif 1002 #ifdef CONFIG_L2TPV3 1003 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, 1004 #endif 1005 }; 1006 1007 1008 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) 1009 { 1010 NetClientState *peer = NULL; 1011 NetClientState *nc; 1012 1013 if (is_netdev) { 1014 if (netdev->type == NET_CLIENT_DRIVER_NIC || 1015 !net_client_init_fun[netdev->type]) { 1016 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1017 "a netdev backend type"); 1018 return -1; 1019 } 1020 } else { 1021 if (netdev->type == NET_CLIENT_DRIVER_NONE) { 1022 return 0; /* nothing to do */ 1023 } 1024 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT || 1025 !net_client_init_fun[netdev->type]) { 1026 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type", 1027 "a net backend type (maybe it is not compiled " 1028 "into this binary)"); 1029 return -1; 1030 } 1031 1032 /* Do not add to a hub if it's a nic with a netdev= parameter. */ 1033 if (netdev->type != NET_CLIENT_DRIVER_NIC || 1034 !netdev->u.nic.has_netdev) { 1035 peer = net_hub_add_port(0, NULL, NULL); 1036 } 1037 } 1038 1039 nc = qemu_find_netdev(netdev->id); 1040 if (nc) { 1041 error_setg(errp, "Duplicate ID '%s'", netdev->id); 1042 return -1; 1043 } 1044 1045 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { 1046 /* FIXME drop when all init functions store an Error */ 1047 if (errp && !*errp) { 1048 error_setg(errp, "Device '%s' could not be initialized", 1049 NetClientDriver_str(netdev->type)); 1050 } 1051 return -1; 1052 } 1053 1054 if (is_netdev) { 1055 nc = qemu_find_netdev(netdev->id); 1056 assert(nc); 1057 nc->is_netdev = true; 1058 } 1059 1060 return 0; 1061 } 1062 1063 void show_netdevs(void) 1064 { 1065 int idx; 1066 const char *available_netdevs[] = { 1067 "socket", 1068 "hubport", 1069 "tap", 1070 #ifdef CONFIG_SLIRP 1071 "user", 1072 #endif 1073 #ifdef CONFIG_L2TPV3 1074 "l2tpv3", 1075 #endif 1076 #ifdef CONFIG_VDE 1077 "vde", 1078 #endif 1079 #ifdef CONFIG_NET_BRIDGE 1080 "bridge", 1081 #endif 1082 #ifdef CONFIG_NETMAP 1083 "netmap", 1084 #endif 1085 #ifdef CONFIG_POSIX 1086 "vhost-user", 1087 #endif 1088 #ifdef CONFIG_VHOST_VDPA 1089 "vhost-vdpa", 1090 #endif 1091 }; 1092 1093 qemu_printf("Available netdev backend types:\n"); 1094 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { 1095 qemu_printf("%s\n", available_netdevs[idx]); 1096 } 1097 } 1098 1099 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) 1100 { 1101 gchar **substrings = NULL; 1102 Netdev *object = NULL; 1103 int ret = -1; 1104 Visitor *v = opts_visitor_new(opts); 1105 1106 /* Parse convenience option format ip6-net=fec0::0[/64] */ 1107 const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); 1108 1109 if (ip6_net) { 1110 char *prefix_addr; 1111 unsigned long prefix_len = 64; /* Default 64bit prefix length. */ 1112 1113 substrings = g_strsplit(ip6_net, "/", 2); 1114 if (!substrings || !substrings[0]) { 1115 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", 1116 "a valid IPv6 prefix"); 1117 goto out; 1118 } 1119 1120 prefix_addr = substrings[0]; 1121 1122 /* Handle user-specified prefix length. */ 1123 if (substrings[1] && 1124 qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) 1125 { 1126 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, 1127 "ipv6-prefixlen", "a number"); 1128 goto out; 1129 } 1130 1131 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); 1132 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, 1133 &error_abort); 1134 qemu_opt_unset(opts, "ipv6-net"); 1135 } 1136 1137 /* Create an ID for -net if the user did not specify one */ 1138 if (!is_netdev && !qemu_opts_id(opts)) { 1139 qemu_opts_set_id(opts, id_generate(ID_NET)); 1140 } 1141 1142 if (visit_type_Netdev(v, NULL, &object, errp)) { 1143 ret = net_client_init1(object, is_netdev, errp); 1144 } 1145 1146 qapi_free_Netdev(object); 1147 1148 out: 1149 g_strfreev(substrings); 1150 visit_free(v); 1151 return ret; 1152 } 1153 1154 void netdev_add(QemuOpts *opts, Error **errp) 1155 { 1156 net_client_init(opts, true, errp); 1157 } 1158 1159 void qmp_netdev_add(Netdev *netdev, Error **errp) 1160 { 1161 if (!id_wellformed(netdev->id)) { 1162 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); 1163 return; 1164 } 1165 1166 net_client_init1(netdev, true, errp); 1167 } 1168 1169 void qmp_netdev_del(const char *id, Error **errp) 1170 { 1171 NetClientState *nc; 1172 QemuOpts *opts; 1173 1174 nc = qemu_find_netdev(id); 1175 if (!nc) { 1176 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1177 "Device '%s' not found", id); 1178 return; 1179 } 1180 1181 if (!nc->is_netdev) { 1182 error_setg(errp, "Device '%s' is not a netdev", id); 1183 return; 1184 } 1185 1186 qemu_del_net_client(nc); 1187 1188 /* 1189 * Wart: we need to delete the QemuOpts associated with netdevs 1190 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in 1191 * HMP netdev_add. 1192 */ 1193 opts = qemu_opts_find(qemu_find_opts("netdev"), id); 1194 if (opts) { 1195 qemu_opts_del(opts); 1196 } 1197 } 1198 1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf) 1200 { 1201 char *str; 1202 ObjectProperty *prop; 1203 ObjectPropertyIterator iter; 1204 Visitor *v; 1205 1206 /* generate info str */ 1207 object_property_iter_init(&iter, OBJECT(nf)); 1208 while ((prop = object_property_iter_next(&iter))) { 1209 if (!strcmp(prop->name, "type")) { 1210 continue; 1211 } 1212 v = string_output_visitor_new(false, &str); 1213 object_property_get(OBJECT(nf), prop->name, v, NULL); 1214 visit_complete(v, &str); 1215 visit_free(v); 1216 monitor_printf(mon, ",%s=%s", prop->name, str); 1217 g_free(str); 1218 } 1219 monitor_printf(mon, "\n"); 1220 } 1221 1222 void print_net_client(Monitor *mon, NetClientState *nc) 1223 { 1224 NetFilterState *nf; 1225 1226 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, 1227 nc->queue_index, 1228 NetClientDriver_str(nc->info->type), 1229 nc->info_str); 1230 if (!QTAILQ_EMPTY(&nc->filters)) { 1231 monitor_printf(mon, "filters:\n"); 1232 } 1233 QTAILQ_FOREACH(nf, &nc->filters, next) { 1234 monitor_printf(mon, " - %s: type=%s", 1235 object_get_canonical_path_component(OBJECT(nf)), 1236 object_get_typename(OBJECT(nf))); 1237 netfilter_print_info(mon, nf); 1238 } 1239 } 1240 1241 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name, 1242 Error **errp) 1243 { 1244 NetClientState *nc; 1245 RxFilterInfoList *filter_list = NULL, **tail = &filter_list; 1246 1247 QTAILQ_FOREACH(nc, &net_clients, next) { 1248 RxFilterInfo *info; 1249 1250 if (has_name && strcmp(nc->name, name) != 0) { 1251 continue; 1252 } 1253 1254 /* only query rx-filter information of NIC */ 1255 if (nc->info->type != NET_CLIENT_DRIVER_NIC) { 1256 if (has_name) { 1257 error_setg(errp, "net client(%s) isn't a NIC", name); 1258 assert(!filter_list); 1259 return NULL; 1260 } 1261 continue; 1262 } 1263 1264 /* only query information on queue 0 since the info is per nic, 1265 * not per queue 1266 */ 1267 if (nc->queue_index != 0) 1268 continue; 1269 1270 if (nc->info->query_rx_filter) { 1271 info = nc->info->query_rx_filter(nc); 1272 QAPI_LIST_APPEND(tail, info); 1273 } else if (has_name) { 1274 error_setg(errp, "net client(%s) doesn't support" 1275 " rx-filter querying", name); 1276 assert(!filter_list); 1277 return NULL; 1278 } 1279 1280 if (has_name) { 1281 break; 1282 } 1283 } 1284 1285 if (filter_list == NULL && has_name) { 1286 error_setg(errp, "invalid net client name: %s", name); 1287 } 1288 1289 return filter_list; 1290 } 1291 1292 NetdevInfoList *qmp_query_netdev(Error **errp) 1293 { 1294 NetdevInfoList *list = NULL; 1295 NetClientState *nc; 1296 1297 QTAILQ_FOREACH(nc, &net_clients, next) { 1298 /* 1299 * Only look at netdevs (backend network devices), not for each queue 1300 * or NIC / hubport 1301 */ 1302 if (nc->stored_config) { 1303 NetdevInfo *element = QAPI_CLONE(NetdevInfo, nc->stored_config); 1304 1305 g_free(element->id); /* Need to dealloc empty id after clone */ 1306 element->id = g_strdup(nc->name); 1307 1308 element->has_peer_id = nc->peer != NULL; 1309 if (element->has_peer_id) { 1310 element->peer_id = g_strdup(nc->peer->name); 1311 } 1312 1313 QAPI_LIST_PREPEND(list, element); 1314 } 1315 } 1316 1317 return list; 1318 } 1319 1320 void hmp_info_network(Monitor *mon, const QDict *qdict) 1321 { 1322 NetClientState *nc, *peer; 1323 NetClientDriver type; 1324 1325 net_hub_info(mon); 1326 1327 QTAILQ_FOREACH(nc, &net_clients, next) { 1328 peer = nc->peer; 1329 type = nc->info->type; 1330 1331 /* Skip if already printed in hub info */ 1332 if (net_hub_id_for_client(nc, NULL) == 0) { 1333 continue; 1334 } 1335 1336 if (!peer || type == NET_CLIENT_DRIVER_NIC) { 1337 print_net_client(mon, nc); 1338 } /* else it's a netdev connected to a NIC, printed with the NIC */ 1339 if (peer && type == NET_CLIENT_DRIVER_NIC) { 1340 monitor_printf(mon, " \\ "); 1341 print_net_client(mon, peer); 1342 } 1343 } 1344 } 1345 1346 void colo_notify_filters_event(int event, Error **errp) 1347 { 1348 NetClientState *nc; 1349 NetFilterState *nf; 1350 NetFilterClass *nfc = NULL; 1351 Error *local_err = NULL; 1352 1353 QTAILQ_FOREACH(nc, &net_clients, next) { 1354 QTAILQ_FOREACH(nf, &nc->filters, next) { 1355 nfc = NETFILTER_GET_CLASS(OBJECT(nf)); 1356 nfc->handle_event(nf, event, &local_err); 1357 if (local_err) { 1358 error_propagate(errp, local_err); 1359 return; 1360 } 1361 } 1362 } 1363 } 1364 1365 void qmp_set_link(const char *name, bool up, Error **errp) 1366 { 1367 NetClientState *ncs[MAX_QUEUE_NUM]; 1368 NetClientState *nc; 1369 int queues, i; 1370 1371 queues = qemu_find_net_clients_except(name, ncs, 1372 NET_CLIENT_DRIVER__MAX, 1373 MAX_QUEUE_NUM); 1374 1375 if (queues == 0) { 1376 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, 1377 "Device '%s' not found", name); 1378 return; 1379 } 1380 nc = ncs[0]; 1381 1382 for (i = 0; i < queues; i++) { 1383 ncs[i]->link_down = !up; 1384 } 1385 1386 if (nc->info->link_status_changed) { 1387 nc->info->link_status_changed(nc); 1388 } 1389 1390 if (nc->peer) { 1391 /* Change peer link only if the peer is NIC and then notify peer. 1392 * If the peer is a HUBPORT or a backend, we do not change the 1393 * link status. 1394 * 1395 * This behavior is compatible with qemu hubs where there could be 1396 * multiple clients that can still communicate with each other in 1397 * disconnected mode. For now maintain this compatibility. 1398 */ 1399 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 1400 for (i = 0; i < queues; i++) { 1401 ncs[i]->peer->link_down = !up; 1402 } 1403 } 1404 if (nc->peer->info->link_status_changed) { 1405 nc->peer->info->link_status_changed(nc->peer); 1406 } 1407 } 1408 } 1409 1410 static void net_vm_change_state_handler(void *opaque, bool running, 1411 RunState state) 1412 { 1413 NetClientState *nc; 1414 NetClientState *tmp; 1415 1416 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { 1417 if (running) { 1418 /* Flush queued packets and wake up backends. */ 1419 if (nc->peer && qemu_can_send_packet(nc)) { 1420 qemu_flush_queued_packets(nc->peer); 1421 } 1422 } else { 1423 /* Complete all queued packets, to guarantee we don't modify 1424 * state later when VM is not running. 1425 */ 1426 qemu_flush_or_purge_queued_packets(nc, true); 1427 } 1428 } 1429 } 1430 1431 void net_cleanup(void) 1432 { 1433 NetClientState *nc; 1434 1435 /* We may del multiple entries during qemu_del_net_client(), 1436 * so QTAILQ_FOREACH_SAFE() is also not safe here. 1437 */ 1438 while (!QTAILQ_EMPTY(&net_clients)) { 1439 nc = QTAILQ_FIRST(&net_clients); 1440 if (nc->info->type == NET_CLIENT_DRIVER_NIC) { 1441 qemu_del_nic(qemu_get_nic(nc)); 1442 } else { 1443 qemu_del_net_client(nc); 1444 } 1445 } 1446 1447 qemu_del_vm_change_state_handler(net_change_state_entry); 1448 } 1449 1450 void net_check_clients(void) 1451 { 1452 NetClientState *nc; 1453 int i; 1454 1455 net_hub_check_clients(); 1456 1457 QTAILQ_FOREACH(nc, &net_clients, next) { 1458 if (!nc->peer) { 1459 warn_report("%s %s has no peer", 1460 nc->info->type == NET_CLIENT_DRIVER_NIC 1461 ? "nic" : "netdev", 1462 nc->name); 1463 } 1464 } 1465 1466 /* Check that all NICs requested via -net nic actually got created. 1467 * NICs created via -device don't need to be checked here because 1468 * they are always instantiated. 1469 */ 1470 for (i = 0; i < MAX_NICS; i++) { 1471 NICInfo *nd = &nd_table[i]; 1472 if (nd->used && !nd->instantiated) { 1473 warn_report("requested NIC (%s, model %s) " 1474 "was not created (not supported by this machine?)", 1475 nd->name ? nd->name : "anonymous", 1476 nd->model ? nd->model : "unspecified"); 1477 } 1478 } 1479 } 1480 1481 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) 1482 { 1483 return net_client_init(opts, false, errp); 1484 } 1485 1486 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) 1487 { 1488 const char *type = qemu_opt_get(opts, "type"); 1489 1490 if (type && is_help_option(type)) { 1491 show_netdevs(); 1492 exit(0); 1493 } 1494 return net_client_init(opts, true, errp); 1495 } 1496 1497 /* For the convenience "--nic" parameter */ 1498 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) 1499 { 1500 char *mac, *nd_id; 1501 int idx, ret; 1502 NICInfo *ni; 1503 const char *type; 1504 1505 type = qemu_opt_get(opts, "type"); 1506 if (type && g_str_equal(type, "none")) { 1507 return 0; /* Nothing to do, default_net is cleared in vl.c */ 1508 } 1509 1510 idx = nic_get_free_idx(); 1511 if (idx == -1 || nb_nics >= MAX_NICS) { 1512 error_setg(errp, "no more on-board/default NIC slots available"); 1513 return -1; 1514 } 1515 1516 if (!type) { 1517 qemu_opt_set(opts, "type", "user", &error_abort); 1518 } 1519 1520 ni = &nd_table[idx]; 1521 memset(ni, 0, sizeof(*ni)); 1522 ni->model = qemu_opt_get_del(opts, "model"); 1523 1524 /* Create an ID if the user did not specify one */ 1525 nd_id = g_strdup(qemu_opts_id(opts)); 1526 if (!nd_id) { 1527 nd_id = id_generate(ID_NET); 1528 qemu_opts_set_id(opts, nd_id); 1529 } 1530 1531 /* Handle MAC address */ 1532 mac = qemu_opt_get_del(opts, "mac"); 1533 if (mac) { 1534 ret = net_parse_macaddr(ni->macaddr.a, mac); 1535 g_free(mac); 1536 if (ret) { 1537 error_setg(errp, "invalid syntax for ethernet address"); 1538 goto out; 1539 } 1540 if (is_multicast_ether_addr(ni->macaddr.a)) { 1541 error_setg(errp, "NIC cannot have multicast MAC address"); 1542 ret = -1; 1543 goto out; 1544 } 1545 } 1546 qemu_macaddr_default_if_unset(&ni->macaddr); 1547 1548 ret = net_client_init(opts, true, errp); 1549 if (ret == 0) { 1550 ni->netdev = qemu_find_netdev(nd_id); 1551 ni->used = true; 1552 nb_nics++; 1553 } 1554 1555 out: 1556 g_free(nd_id); 1557 return ret; 1558 } 1559 1560 int net_init_clients(Error **errp) 1561 { 1562 net_change_state_entry = 1563 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); 1564 1565 QTAILQ_INIT(&net_clients); 1566 1567 if (qemu_opts_foreach(qemu_find_opts("netdev"), 1568 net_init_netdev, NULL, errp)) { 1569 return -1; 1570 } 1571 1572 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) { 1573 return -1; 1574 } 1575 1576 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) { 1577 return -1; 1578 } 1579 1580 return 0; 1581 } 1582 1583 int net_client_parse(QemuOptsList *opts_list, const char *optarg) 1584 { 1585 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) { 1586 return -1; 1587 } 1588 1589 return 0; 1590 } 1591 1592 /* From FreeBSD */ 1593 /* XXX: optimize */ 1594 uint32_t net_crc32(const uint8_t *p, int len) 1595 { 1596 uint32_t crc; 1597 int carry, i, j; 1598 uint8_t b; 1599 1600 crc = 0xffffffff; 1601 for (i = 0; i < len; i++) { 1602 b = *p++; 1603 for (j = 0; j < 8; j++) { 1604 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); 1605 crc <<= 1; 1606 b >>= 1; 1607 if (carry) { 1608 crc = ((crc ^ POLYNOMIAL_BE) | carry); 1609 } 1610 } 1611 } 1612 1613 return crc; 1614 } 1615 1616 uint32_t net_crc32_le(const uint8_t *p, int len) 1617 { 1618 uint32_t crc; 1619 int carry, i, j; 1620 uint8_t b; 1621 1622 crc = 0xffffffff; 1623 for (i = 0; i < len; i++) { 1624 b = *p++; 1625 for (j = 0; j < 8; j++) { 1626 carry = (crc & 0x1) ^ (b & 0x01); 1627 crc >>= 1; 1628 b >>= 1; 1629 if (carry) { 1630 crc ^= POLYNOMIAL_LE; 1631 } 1632 } 1633 } 1634 1635 return crc; 1636 } 1637 1638 QemuOptsList qemu_netdev_opts = { 1639 .name = "netdev", 1640 .implied_opt_name = "type", 1641 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), 1642 .desc = { 1643 /* 1644 * no elements => accept any params 1645 * validation will happen later 1646 */ 1647 { /* end of list */ } 1648 }, 1649 }; 1650 1651 QemuOptsList qemu_nic_opts = { 1652 .name = "nic", 1653 .implied_opt_name = "type", 1654 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), 1655 .desc = { 1656 /* 1657 * no elements => accept any params 1658 * validation will happen later 1659 */ 1660 { /* end of list */ } 1661 }, 1662 }; 1663 1664 QemuOptsList qemu_net_opts = { 1665 .name = "net", 1666 .implied_opt_name = "type", 1667 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), 1668 .desc = { 1669 /* 1670 * no elements => accept any params 1671 * validation will happen later 1672 */ 1673 { /* end of list */ } 1674 }, 1675 }; 1676 1677 void net_socket_rs_init(SocketReadState *rs, 1678 SocketReadStateFinalize *finalize, 1679 bool vnet_hdr) 1680 { 1681 rs->state = 0; 1682 rs->vnet_hdr = vnet_hdr; 1683 rs->index = 0; 1684 rs->packet_len = 0; 1685 rs->vnet_hdr_len = 0; 1686 memset(rs->buf, 0, sizeof(rs->buf)); 1687 rs->finalize = finalize; 1688 } 1689 1690 /* 1691 * Returns 1692 * 0: success 1693 * -1: error occurs 1694 */ 1695 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) 1696 { 1697 unsigned int l; 1698 1699 while (size > 0) { 1700 /* Reassemble a packet from the network. 1701 * 0 = getting length. 1702 * 1 = getting vnet header length. 1703 * 2 = getting data. 1704 */ 1705 switch (rs->state) { 1706 case 0: 1707 l = 4 - rs->index; 1708 if (l > size) { 1709 l = size; 1710 } 1711 memcpy(rs->buf + rs->index, buf, l); 1712 buf += l; 1713 size -= l; 1714 rs->index += l; 1715 if (rs->index == 4) { 1716 /* got length */ 1717 rs->packet_len = ntohl(*(uint32_t *)rs->buf); 1718 rs->index = 0; 1719 if (rs->vnet_hdr) { 1720 rs->state = 1; 1721 } else { 1722 rs->state = 2; 1723 rs->vnet_hdr_len = 0; 1724 } 1725 } 1726 break; 1727 case 1: 1728 l = 4 - rs->index; 1729 if (l > size) { 1730 l = size; 1731 } 1732 memcpy(rs->buf + rs->index, buf, l); 1733 buf += l; 1734 size -= l; 1735 rs->index += l; 1736 if (rs->index == 4) { 1737 /* got vnet header length */ 1738 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); 1739 rs->index = 0; 1740 rs->state = 2; 1741 } 1742 break; 1743 case 2: 1744 l = rs->packet_len - rs->index; 1745 if (l > size) { 1746 l = size; 1747 } 1748 if (rs->index + l <= sizeof(rs->buf)) { 1749 memcpy(rs->buf + rs->index, buf, l); 1750 } else { 1751 fprintf(stderr, "serious error: oversized packet received," 1752 "connection terminated.\n"); 1753 rs->index = rs->state = 0; 1754 return -1; 1755 } 1756 1757 rs->index += l; 1758 buf += l; 1759 size -= l; 1760 if (rs->index >= rs->packet_len) { 1761 rs->index = 0; 1762 rs->state = 0; 1763 assert(rs->finalize); 1764 rs->finalize(rs); 1765 } 1766 break; 1767 } 1768 } 1769 1770 assert(size == 0); 1771 return 0; 1772 } 1773